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[俺の備忘録シリーズ] DataTablesを使ってサーバーサイドのページネーション

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準備

CakePHP2でAjaxでjson使うので、.jsonでアクセス出来るようにする

route.php
Router::parseExtensions('json');

jsを読み込む

index.ctp
<?= $this->Html->script('https://cdn.datatables.net/1.10.12/js/jquery.dataTables.min.js') ?>

クライアントサイド実装

とりあえず、Userテーブルの名前だけを出す感じのTableをコーディング

index.ctp
<table id="table">
	<thead>
		<tr>
			<th>名前</th>
		</tr>
	</thead>
	<tbody>
	</tbody>
</table>

サーバーサイドでページネーションをする場合は、serverSideをtrueにする

index.ctp
$(document).ready(function() {
	$('#table').DataTable({
		"ajax": "/hoge/read_users.json",
		"dataSrc": "data",
		"columns": [
			{ data: "name" },
		],
		"serverSide": true,
	});
});

サーバーサイド実装

Ajax使うので、コントローラにRequestHandlerを追加

HogeController.php
var $components = ['RequestHandler'];

メソッドの追加

HogeController.php
public function read_users() {
  if (!$this->request->is('ajax')) {
    throw new BadRequestException('そこはダメよ!');
  }
  $this->response->header('X-Content-Type-Options', 'nosniff');
  // 単独テーブルアクセス
  $options = [
    'recursive' => -1,
  ];
  // 全件数取得
  $count = $this->User->find('count', $options);
  // クライアントから送られてきたページ位置をセット
  $options['offset'] = $this->request->query('iDisplayStart');
  $options['limit'] = $this->request->query('iDisplayLength');
  $options['page'] = 0;

  $data = $this->User->find('all', $options);
  // TODO: エラー処理
  $data = Hash::extract($data, '{n}.User');

  $this->set('draw', $this->request->query('sEcho'));
  $this->set('recordsTotal', $count);
  $this->set('recordsFiltered', $count);
  $this->set('data', $data);
  $this->set('_serialize', [ 'draw', 'recordsTotal', 'recordsFiltered', 'data' ]);
}
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